<template>
  <el-container class="home">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="@/assets/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 主体区域 -->
    <el-container>
      <!-- 左侧侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!-- 侧边栏菜单 -->
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eff"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          router
          :default-active="activePath"
        >
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <template slot="title">
              <i :class="icons[item.id]"></i>
              <span>{{ item.authName }}</span>
            </template>
            <el-menu-item
              :index="'/' + sub.path"
              v-for="sub in item.children"
              @click="saveNavState('/' + sub.path)"
              :key="sub.id">
              <template slot="title">
              <i class="el-icon-menu"></i>
              <span>{{ sub.authName}}</span>
            </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧页面主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: 'home',
  data() {
    return {
      menuList: [], // 左侧菜单
      icons: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao',
      },
      isCollapse: false, // 是否折叠
      activePath: '', // 被激活的链接
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    // 点击退出登录
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取侧边导航
    async getMenuList() {
      const { data } = await this.$http.get('menus')
      if (data.meta.status !== 200) return this.$message.error(data.meta.msg)
      this.menuList = data.data
    },
    // 点击收缩侧边导航
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    },
  },
}
</script>

<style lang="less" scoped>
.home {
  height: 100%;
}
.el-header {
  background: #373d41;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background: #333744;
  .el-menu{
    border-right: none;
  }
  .toggle-button{
    background: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
}
.el-main {
  background: #eaedf1;
}
.iconfont{
  margin-right: 10px;
}
</style>
